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2 Sheets--Sheet1. 0. BRAUN.

Apparatus for Purifying Gas. N0. 165,785. Patentedluly20,l875

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2 Sheets-Sheet 2.

0. BRAUN. Apparatus fnr Purifying Gas. v No, ]65,785,-Patentedluly20gl875.

ummsswsw a; fim/ OTTO BRAUN, OF BERLIN, PBUSSIA.

IMPROVEMENTEN APPARATUS FOR PURIFVING GAS.

Specification forming part of Letters Patent No. 65,785, dated July 20,1875; application filed June 11, 1875.

To all whom it may concern Be it known that I, OTTO BRAUN, of Berlin, inthe Kingdom of Prussia, have invented a new and useful Improvement inApparatus for Purifying Gas, which improvement is fully set forth in thefollowing specification, reference being had to the accompanyingdrawing, in which Figure l is a plan view of the apparatus used incarrying out my invention. Fig. 2 is a longitudinal central sectionthereof. Fig. 3 is an end view of the same. Fig. 4 is a crosssection inthe plane of the line mm, Fig. 2.

Similar letters indicate corresponding parts.

My invention relates to an apparatus for removing impurities from gas,air, or smoke, and is intended particularly for obtaining usefulproducts from the smoke of mineral coal.

My invention consists of a rotating drum, combined with a hollow shaft,through which the gas passes to and from the drum, and combind withvalves, which are arranged in the periphery of the drum for the purposeof letting out the refuse matter eliminated fromthe smoke. The valvesare connected to a swivel in such a manner that they may besimultaneously opened and without stopping the motion of the drum, whilethe valves are adapted to close by centrifugal force. With the rotatingdrum is combined, further, an annular gutter, to receive the impuritiesdischarging from the drum by means of the valves, the gutter eX- tendinground the circumference of the drum in the path of the valves in such amanner that when the valves are opened the matter thus allowed todischarge from the drum by centrifugal force is received in the gutter,and may be thence conducted to a suitable tank.

The rotating drum contains aseries of vanes, by the action of which thesmoke is made 'to partake of the motion of the drum. The drum, moreover,is divided into two unequal compartments communicating with each other,by means of which and of the vanes the rotary velocity of the smoke isalternately increased and diminished, and thus the elimination ofimpurities from the smoke is facilitated.

In carrying out my invention I moisten the smoke or gas to be purifiedeither by turning into it water or other liquid in the form of spray, orby cooling it, in order to condense the solid substances are eliminatedfrom the gaseous portion of the smoke, and the gas escapes clear.

In the drawing, the letter A designates the form of drum which I preferto use in carrying out my invention. This drum is mounted on a hollowshaft, B, and communicates therewith through openings 0 0 formed in theshaft. The hollow shaft 13 carries tongued wheels D, which engage withgrooved wheels I), mounted in a frame-work, E. By these wheels D thehollow shaft B and the drum are supported and steadied in their rotarymotion. F designates a plate, by means of which the drum A is dividedinto two unequal compartments, A A, the plate F being fastened to thehollow shaft B and crosswise thereof, in such a manner as to close theshaft, and cause a deflection of the smoke passing to the drum. Thediameter of the plate F is less than that of the drum A, so that acommunication is formed between the two compartments A A. G designates aseries of vanes which are arranged within the drum A for the purpose ofassisting in driving the impure substances from the moist smoke when arotary motion is imparted to the drum. These vanes G are fastened to theplate F, and are placed in a tangential position, as shown in Fig. 4.

By the action of the vanes G the rotary velocity of the smoke passingthrough the drum increases in the compartment A, while it is retarded inthe compartment A.

The periphery of the drum A contains a furrow, H, in which are arrangedvalves I, the latter being placed in apertures a, formed in the furrow.The valves are affixed to the ends ofrods J, which are connected to aswivel,

K, having the form of a wheel, and which' is mounted on a spindle, L.This spindle has on its outer. end a hand-wheel, M. By turning thiswheel in either direction, the spindle L and the swivel Kpartake of themovement,

and by this means the valves I can be withdrawn from the apertures a,and any substancev contained in the drum allowed to escape. The valvesmay in like manner be closed, and they have a tendency to retain theirclosed position, by the centrifugal power of the rods J, when the drumis rotated. The valves are intended to be opened from time to timesay,every ten minutesduring the rotation of the drum, in order to free thedrum from refuse matter. In the line of the furrow H, on the exterior ofthe drum A, is placed an annular gutter, N, from the lower part of whichextends a tube, 0, that is intended to be connected with a tank. Thus,when the valves I are opened, and refuse matter escapes from therotating drum, it is received in the gutter N and led to the tank. Thehollow shaft B is provided with a pulley, P, on either side of the drumA, by means of which pulley the shaft and the drum may be given a rotarymotion. This pulley P is hollow, and serves to form a hermetic couplingfor the sections ofthe hollow shaft B, as follows: The outer sections ofthe hollow shaft are provided with a flange, Q, (see Fig. 2,) which ismade to project into the hollow pulleys P, in such a manner that if thepulleys are partially filled with water, and are given a revolvingmotion, the water arranges itself against the inner circumference of thepulleys, and the inlet or outlet of gas or air is prevented.

By this construction, moreover, the part of the hollow shaft carryingthe drum A is adapted to rotate, while the remaining sections arestationary.

The frame of my apparatus is not described in detail, as it has nospecial form. The form of the rotating drum, the number and position ofthe vanes, and of the valves, and the pulleys, can be varied.

It is obvious that my invention is adapted for purifying gases of anykind, as well as smoke. It is applicable also for providing theaters andother buildings with pure, cool, humid air, inasmuch as if air (or gas)is passed through the drum A, after having been exposed to moisture, allimpurities are extracted in like manner as described with respect tosmoke. To get solid bodies out of gases in a dry state, as, forinstance, oxide of zinc from air, (in the preparation of zinc white,) Ivary somewhat the form of the rotating drum and of the valves.

What I claim as new, and desire to secure by Letters Patent, is

1. The apparatus constructed of the drum A, hollow shaft B, and valvesI, for the-purpose of purifying gases, substantially as described.

2. In combination with the valves I, the swivel K, for opening andclosing the valves, substantially as described.

3. The annular gutter N, in combination with the rotating drum A, andvalves 1, sub stantially as described.

4. The rotating drum A, divided into two unequal compartments, A A", asshown, in combination with the vanes G, connected tangentially with theplate F, substantially as described, whereby the rotary velocity of thegases, &c., passed into the said drum is alternately increased anddiminished, and the impurities separated therefrom, as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this1st day of May, 1875.

DR. OTTO BRAUN.

